用不同格式显示日历年日期的 Java 程序

在本文中，我们将了解如何以不同格式显示日历年的日期。Java 没有内置的日期类，但我们可以导入 java.time 包来使用日期和时间 API。该包包括许多日期和时间类。

以下是相同的演示 −

假设我们的输入是 −

Run the program

预期输出为 −

The first date format is:2022-03-17T23:37:37.623304800
The second date format is:17/03/2022
The third date format is:Thursday, 17 Mar 2022

算法

Step 1 - START
Step 2 - Declare an object of LocalDateTime namely date.
Step 3 - Define the values.
Step 4 - Define different date time formats using DateTimeFormatter objects
Step 5 - Display the different date time formats
Step 6 - Stop

示例 1

在这里，我们在“main”函数下将所有操作捆绑在一起。

Open Compiler
import java.time.*;
import java.time.format.DateTimeFormatter;
public class Demo {
   public static void main(String[] args){
      System.out.println("The required packages have been imported");
      LocalDateTime date = LocalDateTime.now();
      System.out.println("A LocalDateTime object has been defined");
      System.out.println("\nThe first date format is:" +date);
      DateTimeFormatter date_format_1 = DateTimeFormatter.ofPattern("dd/MM/yyyy");
      String formattedDate_1 = date.format(date_format_1);
      System.out.println("\nThe second date format is:" +formattedDate_1);
      DateTimeFormatter date_format_2 = DateTimeFormatter.ofPattern("EEEE, dd MMM yyyy");
      String formattedDate_2 = date.format(date_format_2);
      System.out.println("\nThe third date format is:" +formattedDate_2);
   }
}

Learn Java in-depth with real-world projects through our Java certification course. Enroll and become a certified expert to boost your career.

输出

The required packages have been imported
A LocalDateTime object has been defined
The first date format is:2022-03-17T23:37:37.623304800
The second date format is:17/03/2022
The third date format is:Thursday, 17 Mar 2022

示例 2

在这里，我们将操作封装到函数中，展示面向对象的编程。

Open Compiler
import java.time.*;
import java.time.format.DateTimeFormatter;
public class Demo {
   static void print_date_format(LocalDateTime date){
      DateTimeFormatter date_format_1 = DateTimeFormatter.ofPattern("dd/MM/yyyy");
      String formattedDate_1 = date.format(date_format_1);
      System.out.println("\nThe second date format is:" +formattedDate_1);
      DateTimeFormatter date_format_2 = DateTimeFormatter.ofPattern("EEEE, dd MMM yyyy");
      String formattedDate_2 = date.format(date_format_2);
      System.out.println("\nThe third date format is:" +formattedDate_2);
   }
   public static void main(String[] args){
      System.out.println("The required packages have been imported");
      LocalDateTime date = LocalDateTime.now();
      System.out.println("A LocalDateTime object has been defined");
      System.out.println("\nThe first date format is:" +date);
      print_date_format(date);
   }
}

输出

The required packages have been imported
A LocalDateTime object has been defined
The first date format is:2022-03-17T23:37:37.623304800
The second date format is:17/03/2022
The third date format is:Thursday, 17 Mar 2022

更新日期：2022 年 3 月 30 日

314 次浏览

启动您的 事业

通过完成课程获得认证

入门
广告